LMS 7.9.0 prevents Windows 10 from going to sleep

LMS 7.9.0 is preventing my computer (Windows 10) from going to sleep.

I've searched the old threads on this, and tried quite a few of the suggested fixes, but no help. The only thing that works (aside from stopping LMS altogether) is disabling "Prevent System Standby", but I don't want the PC to go to sleep while it's playing music obviously.

I've got uPnP/DLNA disabled.

My only device is a Squeezebox Touch. It's connected to the router by Ethernet, and the PC is connected to the router by Ethernet. An old thread suggested the Touch might be the problem, but I've completely powered it down, and I still can't get the PC to go to sleep while LMS is running, so I don't think that's it.

Another post said it could be iPeng, which I do have on my iPhone, but the problem persists even if I completely turn off the iPhone.

There were some suggestions in the old threads that it may be a BIOS setting that needs to be fixed re Wake-on-LAN or magic packet settings. But I don't know what to do or where to go in the BIOS settings to do that.

My motherboard is an ASUS Z170-A, running UEFI BIOS version 1702 x64.

Any help?

Thanks,
Mike